Multiplicity dependence of light (anti-)nuclei production in p–Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration. (2020). Multiplicity dependence of light (anti-)nuclei production in p–Pb collisions at √sNN = 5.02 TeV. Physics Letters B, 800, Article 135043. https://doi.org/10.1016/j.physletb.2019.135043
Published inPhysics Letters B
DisciplineFysiikkaYdin- ja kiihdytinfysiikan huippuyksikköPhysicsCentre of Excellence in Nuclear and Accelerator Based Physics
© 2019 Published by Elsevier B.V.
The measurement of the deuteron and anti-deuteron production in the rapidity range −1 < y < 0 as a function of transverse momentum and event multiplicity in p–Pb collisions at √sNN = 5.02 TeV is presented. (Anti-)deuterons are identiﬁed via their speciﬁc energy loss dE/dx and via their time-of-ﬂight. Their production in p–Pb collisions is compared to pp and Pb–Pb collisions and is discussed within the context of thermal and coalescence models. The ratio of integrated yields of deuterons to protons (d/p) shows a signiﬁcant increase as a function of the charged-particle multiplicity of the event starting from values similar to those observed in pp collisions at low multiplicities and approaching those observed in Pb–Pb collisions at high multiplicities. The mean transverse particle momenta are extracted from the deuteron spectra and the values are similar to those obtained for p and particles. Thus, deuteron spectra do not follow mass ordering. This behaviour is in contrast to the trend observed for non-composite particles in p–Pb collisions. In addition, the production of the rare 3He and 3He nuclei has been studied. The spectrum corresponding to all non-single diffractive p-Pb collisions is obtained in the rapidity window −1 < y < 0 and the pT-integrated yield dN/dy is extracted. It is found that the yields of protons, deuterons, and 3He, normalised by the spin degeneracy factor, follow an exponential decrease with mass number. ...